MHT CET2007PhysicsSemiconductors
When intensity of incident light increases
Options
- Aphoto-current increases
- Bphoto-current decreases
- Ckinetic energy of emitted photoelectrons increases
- Dkinetic energy of emitted photoelectrons decreases
Correct answer
A. photo-current increases
Step-by-step solution
According to Einstein's theory of photoelectric effect a single incident photon ejects a single electron. Therefore, when intensity increases, the number of incident photons increases, so number of ejected electrons increases, hence, photocurrent increases. Now, maximum energy of = 1 2 m v_ ² and 1 2 m v_ ²=e V₀ , where V₀ is stopping potential. Thus, the maximum kinetic energy of the electrons does not depend upon the intensity of the incident rays, because the stopping potential is not affected by the increase of